CN106644954A - Saline soil all-carbon content detection method - Google Patents
Saline soil all-carbon content detection method Download PDFInfo
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- CN106644954A CN106644954A CN201610883170.8A CN201610883170A CN106644954A CN 106644954 A CN106644954 A CN 106644954A CN 201610883170 A CN201610883170 A CN 201610883170A CN 106644954 A CN106644954 A CN 106644954A
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Abstract
The invention provides a saline soil all-carbon content detection method which includes the specific steps: collecting and pre-treating soil samples by taking saline soil as a detection object; measuring the reflectivity of the pre-treated soil samples to obtain reflectivity data of 350-2500nm wave bands; performing multiplicative scatter correction for the reflectivity data of the 350-2500nm wave bands, reducing noise by small waves and then smoothing the reflectivity data; extracting the reflectivity data of the soil samples at a specific wave band; substituting the reflectivity data of the wave bands into a saline soil all-carbon content detection model and calculating saline soil all-carbon content. The detection method is high in accuracy, small in interference, high in feasibility and suitable for popularization and application and has the advantages of no pollution, simplicity and convenience in operation, rapidness and accuracy, and detection limit is improved.
Description
Technical field
The present invention relates to the detection of carbon in soil content, the detection of full carbon content in more particularly to a kind of salinization soil
Method.
Background technology
Carbon base in soil is reservoir maximum in terrestrial ecosystems carbon storehouse, and is the part wherein enlivened very much.The whole world
There are about 1.4 × 1018～1.5 × 1018G carbon is stored in earth soil with organic matter form, be land vehicles carbon storehouse (0.5 ×
1018～0.6 × 1018G) 2～3 times, are atmospheric carbons (0.75 × 1018G) 2 times.The result of various model predictions shows, arrives
CO in the year two thousand thirty air2Concentration will be doubled, and global average temperature of the whole year will raise 1.5～4.5 DEG C, and precipitation may increase by 7～15%.
This undoubtedly can produce tremendous influence to Soil carbon storage and its dynamic change.Soil is the acceptor of climate change effect,
It is the keeper of climate change, impact of the whole world change being characterized with climate warming to terrestrial ecosystems will cause soil carbon
Reserves and the change of dynamic equilibrium.Changing more by a small margin for carbon base in soil reserves, with the reinforcement of greenhouse effects or can weaken to come by force
Earth climate system is affected strongly.The research of Soil carbon storage contribute to disclose soil carbon preserve to responding to global change when
Between, mode and scale.The content of the full carbon of soil and its dynamic equilibrium are also an important indicator for reflecting soil quality, and to soil
The sustainability of earth fertility has a major impact.Research Soil carbon storage, it will help seek how scientifically using and protection have
The soil resource of limit, slows down soil greenhouse Gas Emission, improves soil quality, and the ecological recovery and environment of degraded land are controlled
Reason and protection etc. have important meaning.
Soil carbon storage data are for prediction Rehabilitation with World Climatic Variation and take corresponding decision-making significant.Soil
The full carbon content data of earth be Soil carbon storage calculate most basic basic data, but in existing soil full carbon content detection side
Method needs to prepare chemical reagent, chemical pollution of the tail liquid emissions to environment and the injury to human body in continuous mode, and exists
Complex operation step, the defect of detection time length.It is badly in need of in currently available technology a kind of pollution-free, easy to operate, quick accurate
Salinization soil in full carbon content detection method.
The content of the invention
In order to overcome defect present in prior art, the present invention to propose a kind of pollution-free, easy to operate, quick accurate
Salinization soil in full carbon content detection method, the method achieve the quick and precisely inspection of full carbon content in salinization soil
Survey, it is not necessary to prepare any chemical reagent, it is to avoid chemical tail liquid emissions are to the pollution of environment and to human body in continuous mode
Injury, while also greatly simplify operating procedure, shortens detection time, can meet full carbon content data in salinization soil
Demand, provides for the impact of total carbon situation and research salinization soil to Global climate change in understanding salinization soil
The new tool of quick obtaining basic data.
Specifically, the detection method of the full carbon content of salinization soil that the present invention is provided, comprises the steps：
S1：With salinization soil as detection object, pedotheque is gathered, pre-processed；
S2：The reflectivity of pretreated pedotheque is determined, the reflectivity data of 350-2500nm wave bands is obtained；
S3：The reflectivity data of 350-2500nm wave bands is carried out after multiplicative scatter correction, using wavelet de-noising, then is carried out
Smoothing processing；
S4：Extract pedotheque 1295nm, 1296nm, 2145nm, 2171nm, 2172nm, 2173nm, 2174nm,
2175nm, 2177nm, 2178nm, 2179nm, 2394nm, 2467nm, 2468nm, 2469nm, 2476nm, 2477nm wavelength it is anti-
Penetrate rate data；
S5：The reflectivity data of each wavelength is substituted into into the full carbon content detection model of salinization soil：
Y=108.8922x1+125.6042x2-2481.529x3-207.4458x4-108.4742x5+43.36721x6+
158.6004x7+280.967x8+478.2531x9+578.8373x10+735.5313x11+809.5779x12+166.5708x13+
253.6719x14+92.43398x15-429.9734x16-569.7601x17+ 33.12141, it is calculated the full carbon of salinization soil
Content；
Wherein, Y is the full carbon content of salinization soil, and unit is g/kg；x1、x2、x3、x4、x5、x6、x7、x8、x9、x10、
x11、x12、x13、x14、x15、x16、x17Pedotheque respectively to be detected is 1295,1296,2145,2171,2172,2173,
2174th, 2175,2177,2178,2179,2394,2467,2468,2469, the 2476, reflectivity data of 2477nm wavelength.
Preferably, in S1, the preprocessing process of the pedotheque is specific as follows：
The debris in the pedotheque of collection are removed, the pedotheque is positioned over into room-dry, by air-dried soil
After sample mortar grinder and cross 2mm sieve, grinding sieve after pedotheque be positioned in baking oven under the conditions of 50 DEG C dry 2h after,
Sealing preserve after cooling to room temperature.
Preferably, in S2, the QualitySpec Trek Handheld spectrometers produced using ASD companies of the U.S. determine soil
The reflectivity of sample, the resolution ratio of the spectrometer is 3nm in 350-700nm, and 701-1400nm is 9.8nm, 1401-2500nm
For 8.1nm.
It is highly preferred that in S2, during using the spectrophotometer pedotheque, environment temperature is constant, and pedotheque is contained
In being mounted in the culture dish of pitch-dark a diameter of 5cm, when probe is with pedotheque contact measurement reflectivity, control therebetween
, there is the phenomenon of light leak to avoid probe internally provided light source in distance.
It is highly preferred that pedotheque is laid in after the culture dish of a diameter of 5cm, the thickness of pedotheque is 10-15mm.
Preferably, in S3, the smoothing processing method is Savitzky-Golay Smoothing, and smooth window is 7.
Preferably, in S4,1295nm, 1296nm, 2145nm, 2171nm, 2172nm, 2173nm, 2174nm, 2175nm,
The reflectivity number of 2177nm, 2178nm, 2179nm, 2394nm, 2467nm, 2468nm, 2469nm, 2476nm, 2477nm wavelength
According to respectively same pedotheque is repeated 4 times the mean value of the reflectivity data of measure.
The detection method of the full carbon content of salinization soil that the present invention is provided, realizes the fast of the full carbon content of salinization soil
Fast accurately detection, it is not necessary to prepare any chemical reagent, it is to avoid in continuous mode chemical tail liquid emissions to the pollution of environment and
Injury to human body, while also greatly simplify operating procedure, shortens detection time, can meet the full carbon content of salinization soil
The demand of data, is to understand the impact of total carbon situation and research salinization soil to Global climate change in salinization soil
There is provided the new tool of quick obtaining basic data.The method degree of accuracy is high, disturb little, improves method detection limit, and feasibility is strong,
The characteristics of having pollution-free, easy to operate, quick accurate simultaneously, is adapted to popularization and application.
Description of the drawings
Fig. 1 is the full carbon measured value of salinization soil provided in an embodiment of the present invention and detected value scatter diagram (n=173).
Specific embodiment
In order that those skilled in the art more fully understand that technical scheme can be practiced, with reference to concrete
The invention will be further described for embodiment, but illustrated embodiment is not as a limitation of the invention.
A kind of detection method of the full carbon content of salinization soil, comprises the steps：
With salinization soil as detection object, the present embodiment gram pasture random acquisition 173 in the empty station of Xinjiang Wenxiu County
The salinization soil sample of individual different full carbon contents, removes the handstone and macroscopic root system of plant in these pedotheques
And dry branches and fallen leaves, and pedotheque is positioned over into room-dry, it is fully ground granulating after being easy to, air-dried pedotheque is with grinding
It is all the sieve of 2mm by aperture after alms bowl grinding, grinds the pedotheque after sieving and be positioned in baking oven under the conditions of 50 DEG C and dry
After dry 2h, after cooling to room temperature sealing preserve, completes the pretreatment of pedotheque.
The QualitySpec Trek Handheld spectrometers that pretreated pedotheque is produced using ASD companies of the U.S.
The reflectivity of 173 pedotheques is determined respectively, obtains the reflectivity data of 350-2500nm wave bands；It should be noted that should
The resolution ratio of spectrometer is 3nm in 350-700nm, and 701-1400nm is 9.8nm, and 1401-2500nm is 8.1nm；Using the light
When spectrometer determines pedotheque, environment temperature is constant, and pedotheque is contained in the culture dish of pitch-dark a diameter of 5cm, visits
When head is with pedotheque contact measurement reflectivity, distance therebetween is controlled, light leak occur to avoid probe internally provided light source
Phenomenon, and caused measurement data is inaccurate.Preferably, pedotheque is laid in after the culture dish of a diameter of 5cm, soil
The thickness of sample is optimal with 10-15mm.
Then, polynary scattering school is carried out respectively to the reflectivity data of the 350-2500nm wave bands of this 173 pedotheques
After just, using wavelet de-noising, then it is smoothed, it is preferable that smoothing processing adopts Savitzky-Golay Smoothing
Method, smooth window is 7.
In wave band after above-mentioned process, extract pedotheque respectively 1295nm, 1296nm, 2145nm, 2171nm,
2172nm、2173nm、2174nm、2175nm、2177nm、2178nm、2179nm、2394nm、2467nm、2468nm、2469nm、
The reflectivity data of 2476nm, 2477nm wavelength, by the reflectivity data of each wavelength the full carbon content detection of salinization soil is substituted into
Model：
Y=108.8922x1+125.6042x2-2481.529x3-207.4458x4-108.4742x5+43.36721x6+
158.6004x7+280.967x8+478.2531x9+578.8373x10+735.5313x11+809.5779x12+166.5708x13+
253.6719x14+92.43398x15-429.9734x16-569.7601x17+ 33.12141, it is calculated the full carbon of salinization soil
Content；
Wherein, Y is the full carbon content of salinization soil, and unit is g/kg；x1、x2、x3、x4、x5、x6、x7、x8、x9、x10、
x11、x12、x13、x14、x15、x16、x17Pedotheque respectively to be detected 1295nm, 1296nm, 2145nm, 2171nm,
2172nm、2173nm、2174nm、2175nm、2177nm、2178nm、2179nm、2394nm、2467nm、2468nm、2469nm、
The reflectivity data of 2476nm, 2477nm wavelength.
It should be noted that the full carbon content in order to more accurately detect each pedotheque, we are to same soil
Sample is repeated 4 times measure, obtains the reflectivity data of 4 groups of 350-2500nm wave bands, and to the anti-of every group of 350-2500nm wave band
The rate data of penetrating are carried out after multiplicative scatter correction, using wavelet de-noising, then are smoothed；Respectively 4 measure of extraction is same
Pedotheque 1295nm, 1296nm, 2145nm, 2171nm, 2172nm, 2173nm, 2174nm, 2175nm, 2177nm,
The reflectivity data of 2178nm, 2179nm, 2394nm, 2467nm, 2468nm, 2469nm, 2476nm, 2477nm wavelength, respectively
The mean value of corresponding wavelength is taken, the full carbon content detection model of salinization soil is brought into, that is, obtains the full carbon content of the pedotheque.
Using the actual value of the full carbon content of pedotheque of indoor chemical assay acquisition and using above-mentioned salinization soil
The statistics of detected value that obtains of full carbon content detection model, be specifically shown in Table 1.
Salinization soil DIC content detection result of table 1 (sample number is 173)
As shown in Table 1, actual value is very close with the mean value of both detected values, maximum, minimum of a value；Fig. 1 is salt marsh
Change the full carbon measured value of soil and detected value scatter diagram, as seen from Figure 1 the full carbon content measured value of pedotheque and detected value
Fitting degree.Coefficient of determination R between actual value and detected value20.80 is reached, root-mean-square error RMSE only has 2.13g/kg, put down
Absolute error MAE only has 1.61g/kg, and standard deviation reaches 2.19 with root-mean-square error than RPD, according to RPD evaluation criterions, RPD
>2.0, illustrate the ability that model has high-precision forecast.The result shows that the method for the present invention can be detected accurately and rapidly
Full carbon content in pedotheque.
Embodiment described above is only the preferred embodiment lifted to absolutely prove the present invention, and its protection domain is not limited
In this.Equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the protection of the present invention
Within the scope of, protection scope of the present invention is defined by claims.
Claims (7)
1. the detection method of the full carbon content of a kind of salinization soil, it is characterised in that comprise the steps：
S1：With salinization soil as detection object, pedotheque is gathered, pre-processed；
S2：The reflectivity of pretreated pedotheque is determined, the reflectivity data of 350-2500nm wave bands is obtained；
S3：The reflectivity data of 350-2500nm wave bands is carried out after multiplicative scatter correction, using wavelet de-noising, then being smoothed
Process；
S4：Extract pedotheque 1295nm, 1296nm, 2145nm, 2171nm, 2172nm, 2173nm, 2174nm, 2175nm,
The reflectivity number of 2177nm, 2178nm, 2179nm, 2394nm, 2467nm, 2468nm, 2469nm, 2476nm, 2477nm wavelength
According to；
S5：The reflectivity data of each wavelength is substituted into into the full carbon content detection model of salinization soil：
Y=108.8922x1+125.6042x2-2481.529x3-207.4458x4-108.4742x5+43.36721x6+
158.6004x7+280.967x8+478.2531x9+578.8373x10+735.5313x11+809.5779x12+166.5708x13+
253.6719x14+92.43398x15-429.9734x16-569.7601x17+ 33.12141, it is calculated the full carbon of salinization soil
Content；
Wherein, Y is the full carbon content of salinization soil, and unit is g/kg；x1、x2、x3、x4、x5、x6、x7、x8、x9、x10、x11、
x12、x13、x14、x15、x16、x17Pedotheque respectively to be detected 1295nm, 1296nm, 2145nm, 2171nm, 2172nm,
2173nm、2174nm、2175nm、2177nm、2178nm、2179nm、2394nm、2467nm、2468nm、2469nm、2476nm、
The reflectivity data of 2477nm wavelength.
2. the detection method of the full carbon content of salinization soil according to claim 1, it is characterised in that in S1, the soil
The preprocessing process of earth sample is specific as follows：
The debris in the pedotheque of collection are removed, the pedotheque is positioned over into room-dry, by air-dried pedotheque
With after mortar grinder and cross aperture 2mm sieve, grinding sieve after pedotheque be positioned in baking oven under the conditions of 50 DEG C dry 2h after,
Sealing preserve after cooling to room temperature.
3. the detection method of the full carbon content of salinization soil according to claim 1, it is characterised in that in S2, using U.S.
The QualitySpec Trek Handheld spectrometers of ASD companies of state production determine the reflectivity of pedotheque, the spectrometer
Resolution ratio is 3nm in 350-700nm, and 701-1400nm is 9.8nm, and 1401-2500nm is 8.1nm.
4. the detection method of the full carbon content of salinization soil according to claim 3, it is characterised in that in S2, using institute
When stating spectrophotometer pedotheque, environment temperature is constant, and pedotheque is contained in into the culture dish of pitch-dark a diameter of 5cm
In, when probe is with pedotheque contact measurement reflectivity, distance therebetween is controlled, to avoid probe internally provided light source from occurring
The phenomenon of light leak.
5. the detection method of the full carbon content of salinization soil according to claim 4, it is characterised in that put down pedotheque
After being laid on the culture dish of a diameter of 5cm, the thickness of pedotheque is 10-15mm.
6. the detection method of the full carbon content of salinization soil according to claim 1, it is characterised in that in S3, it is described flat
Sliding processing method is Savitzky-Golay Smoothing methods, and smooth window is 7.
7. the detection method of the full carbon content of salinization soil according to claim 1, it is characterised in that in S4,1295nm,
1296nm、2145nm、2171nm、2172nm、2173nm、2174nm、2175nm、2177nm、2178nm、2179nm、2394nm、
The reflectivity data of 2467nm, 2468nm, 2469nm, 2476nm, 2477nm wavelength, respectively same pedotheque is repeated 4 times
The mean value of the reflectivity data of measure.
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| CN102798614A (en) * | 2012-08-13 | 2012-11-28 | 浙江大学 | Soil total potassium content detection apparatus and method |
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Application publication date: 20170510 |